Dithering device

An operation method performed by a dithering device, the method comprising:

• counting a frame, a row, and a column of input image data based on an enable signal and generating count data;
• generating a plurality of random numbers based on a first seed;
• storing a first random number, a second random number, and a third random number selected based on the count data, among the plurality of random numbers, the first random number corresponding to a frame period associated with the frame, the second random number corresponding to a row period associated with the row, and the third random number corresponding to a column period associated with the column, the frame period corresponds to every first number of frame of the input image data, the row period corresponds to every second number of row of every frame of the input image data, and the column period corresponds to every third number of column of every row of every frame of the input image data;
• generating a dithering mask for n-bit dithering (where n is a positive integer) using a single random number, among the first random number, the second random number, and the third random number, as a second seed;
• and
• applying the dithering mask to the input image data to perform the n-bit dithering.

A display system comprising:

• a plurality of dithering devices;
• and
• a host processor configured to receive an interrupt signal from each of the plurality of dithering devices,
• wherein
• each of the plurality of dithering devices is configured to:
• count a frame, a row, and a column of input image data based on an enable signal and generate count data;
• generate a plurality of random numbers based on a first seed;
• store a first random number, a second random number, and a third random number selected based on the count data, among the plurality of random numbers, the first random number corresponding to a frame period associated with the frame, the second random number corresponding to a row period associated with the row, and the third random number corresponding to a column period associated with the column, the frame period corresponds to every first number of frame of the input image data, the row period corresponds to every second number of row of every frame of the input image data, and the column period corresponds to every third number of column of every row of every frame of the input image data;
• generate a dithering mask for n-bit dithering (where n is a positive integer) using a single random number, among the first random number, the second random number, and the third random number, as a second seed;
• and
• apply the dithering mask to the input image data to perform the n-bit dithering, and
• the host processor determines whether the first seeds overlap each other, based on the interrupt signal.